User blog comment:Gyradoes/Mind BLown/@comment-26120508-20171208025305/@comment-30134594-20171208043733

To be more specific on the whole typing thing. Groudon is more related to being dormant, not active which would soecify being only a ground type while when it goes primal, gaining that fire type could infer to it being related to an active volcano and so on.

I doubt this specifies anything, but if it does, there ya go.

- BeltorTux

P.s I as well thought it was a fire type... damn you Pokemon Ruby Cover...